# Relationship history for MSHA mine 2602541

Current hierarchy: **Elizabeth M  Smith; Ira J  Smith → Crescent Peak Quarries → Crescent Peak Project**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Elizabeth M  Smith  et al → Crescent Peak Project; 2004-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crescent Peak Quarries → Crescent Peak Project; 2008-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elizabeth M  Smith  et al → Crescent Peak Quarries; 2008-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ira J  Smith  et al → Crescent Peak Quarries; 2008-07-09 to current/open; source msha-controller-operator-history